Bobbin



(No Model.)

0. HARDY.

BOBBIN.

Patented Aug. 2, 1887.

fizz/6295027 ia/rzwfiv'e ly,

UNITED STATES PATENT OFFICE.

CHARLES HARDY, OF NASHUA, NEV HAMPSHIRE.

BOBBIN.

SPECIFICATION forming part of Letters Patent No. 367,622, dated August2, 1887.

Application filed November .20, 1856. Serial No. 219,474.

To all whom it may concern:

Be it known that I, CHARLES HARDY, acitizen of the United States,residing at Nashua, in the county of Hillsborough and State of NewHampshire, have invented a new and useful Improvement in Bobbins, ofwhich the following is a specification.

My invention'relates to that class of devices shown in my patent ofAugust 22, 1876, No. 181,436, upon which the present invention is animprovement. It is the purpose of said improvement to provide means forstrengthening such articles against inward or outward strain, and to socombine the strengthening ring or re-enforce therewith that it shall beentirely hidden, preserved from contact, frictional or otherwise, andsupported upon all sides by the material in which it is embedded. It isa further purpose of my invention to so cover and inclose the menforcing ring as to avoid the danger of the checking or splintering andchipping out of the wood in the immediate vicinity of the re-enforce.

The invention consists in the several novel features of construction andnew combinations of parts, hereinafter fully described, and definitelypointed out in the claims following this specification.

Referring to the drawings accompanying this application, Figure 1 is aview of a bobbin with the ends in section. Fig. 2 is a de tailperspective view of one form of re-enforce. Fig. 3 is an enlargedsectional view of one wall of the bobbin, to more clearly illustrate theconstruction. Fig. 4 is an enlarged view of the same with the re-cnforceand filling ring re moved. Fig. 5 is a view of a modified form of there'enforce.

In the said drawings, the referencenumeral 1 denotes a bobbin, or, as itis sometimes termed, a quill, of the primitive form,which does notdiffer materially, so far as my present invention is concerned, from anyof the forms now in use. In one or both ends of this quill or bobbin Iform an annular cavity, 2, cut parallel with the axisand in such manneras to leave a solid wall of the material of which the bobbin is formedupon both the inner and outer side of said chamber. Vithin this annularchamber 2 I place a metallic re-enforce, 3, which may be either a coilof two or more (No model.)

turns, as shown in Fig. 2, formed by winding wire of suitable size upona mandrel, or a solid ring, like that shown in Fig. 5. The depth of thecavity 2 is such, relatively to the size of the re-enforcing ring orcoil, that the latter,

. when forced into the cavity, will only partly fill the same. XVithinthe outer end of said annular cavity or chamber 2 I then insert afilling-ring or annulus, 4, made of the same material as the bobbin andcoated with glue or cement before insertion. This filling-ring closelyfits the chamber and completely closes its open end. Vhen combined withthe bob-' bin in this manner, the re-enforce is not only completelyconcealed from view, butit is wholly inclosed within and supported uponall sides by the walls of the chamber 2 and the end of the filling-ring.By this construction oxidation of the metal of the re-en force iseffectually which are radial to the bobbin, whereas if the rc-cnforcewere inserted in an open chamber or cavity without a filling-ring 4, acrushing strain applied to the hollow tube 1 near either end, but notdirectly over and upon the menforce itself, would frequently cause themetal to yield in a direction parallel, or substantially so,

with the axis of the bobbin and force the ring or coil out of the cavitycontaining it. Moreover, in the absence of the fillingring the metallicoxide, which speedily forms, becomes mingled with the oil or othermoisture, and soon penetrates the wood, rendering the bobbin unfit foruse. Finally, the filling-ring 4, being firmly glued or cemented in thecavity 2, when the bobbin is accidentally crushed, the wood at the endof the tube which adheres to thefillingring will not check or splinterand chip out, as it would if the cemented filling-ring were not present;hence the bobbin may, by the insertion of a conical mandrel, be restoredto its original shape, and will usually be in as good condition as itwas when first constructed.

Heretofore, and prior to my invention, a spool or bobbin has beenprovided with an annular groove in the end, having a wire reenforceinserted therein, the wire being wound or braided with fibrous materialsaturated with glue. In this invention the re-enforce nearly or entirelyfills the annular chamber, and in the absence of the filling-ring it isexposed to oxidation and contact with external objects, since acomparatively-slight frictional contact will abrade or remove thefibrous sheath or covering and expose the metal in the open end of theannular chamber. This construc tion is open to all the objectionsspecified, and has been found incapable of practical use.

In another invention a re enforcing ring composed of a compound of glue,glycerine, and sulphate of lead has been applied to the exterior of abobbin at or near the end, and a reenforce composed of the samematerials has been placed in an annular chamber in the end of thebobbin, no fillingring being employed.

Finally, in my own patent, No. 181,436, hereinbefore mentioned, a metalre-enforce is employed, held in place by a bushing; but instead of anannular chamber cut in the end of the bobbin the inner surface of thelatter is chamfcred or gained, and the re-enforce is set therein withits inner face wholly exposed, and the filling-ring is then inserted,its inner surface being without support. \Vith this construction theire-enforce is exposed to oxidation, and when the bobbin is crushed thefilling-ring is extremely liable to splinter excessively, because of itswant of support upon its inner face,-and when the bobbin is restored toshape pieces of said ring are liable to chip out and fall off. The sameor a similar result is met with in all cases where no filling-ring isemployed, cemented to both the inner and outer walls of the annularchamber.

By my invention great strength and durability are imparted to the bobbinby the support of the re-enforce upon all sides. OXidation of the metalis entirely avoided, and should the tube be accidentally crushed itmaybe restored to shape without causing the wood to check out and exposethe re-enforcing ring. Moreover, by entirely inclosing the ring I amable to dispense with anything like a fibrous coating or covering, andam able, therefore, to employ a much thicker re-enforce than would bepossible if the metal were wound before insertingit. Finally, thefilling-ring being of the same material and of the'same grain as thebobbin when the same is cemented in and the wood dressed down to finishthe bobbin, the latter becomes, both in appearance and practical use,the same as if the whole were formed of one solid piece with a metal re-enforce embedded. My invention is the same whether the solid ring 3 orthe spiral coil 3 is employed.

Having thus described my invention, what I claim is v 1. A bobbin havingan annular cavity or chamber in its end, in combination with a metallicre-enforce partly filling said chamber, and a filling-ring inserted inand wholly closing the open end of said chamber, substantially asspecified. Y

2. A bobbin having an annular cavity or chamber cut in its end, incombination with a metallic re-enforce partly filling said chamber, anda filling-ring cemented in the open end of said chamber, the re-enforeebeing supported and inclosed 011 three sides by the walls of saidannular chamber and upon the fourth side by the fillingring,substantially as specified.

3. The combination, with the bobbin 1, hav ing an annular chamber, 2, inits end, of a spiral rcenforcing coil, 3, and a filliug-ring,4, allconstructed and arranged substantially as specified.

CHARLES HARDY.

W'itnesses:

O. L. LOVELANI), It. T. SMITH.

